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Chess engine: Stockfish 21021123

on

Stockfish - UCI chess engine, compiled by Vizvezdenec
Rating JCER=3151

Timestamp: 1613083146
PV-Nodes likely to fail low
Do not decrease reduction at pv-nodes which are likely to fail low.

The idea of this patch can be described as following: during the search, if a node on the principal variation was re-searched in non-pv search and this re-search got a value which was much lower than alpha, then we can assume that this pv-node is
likely to fail low again, and we can reduce more aggressively at this node.

Passed STC
https://tests.stockfishchess.org/tests/view/6023a5fa7f517a561bc49638
LLR: 2.95 (-2.94,2.94) {-0.25,1.25}
Total: 70288 W: 6443 L: 6223 D: 57622 Elo +1.09
Ptnml(0-2): 239, 5022, 24436, 5174, 273

Passed LTC
https://tests.stockfishchess.org/tests/view/6023f2617f517a561bc49661
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 105656 W: 4048 L: 3748 D: 97860 Elo +0.99
Ptnml(0-2): 67, 3312, 45761, 3630, 58
Bench: 3766422

Stockfish 21021123 and NNUE download

 

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